Today we will consider a cotangent of 210 degrees. We will draw a unit disk and we will write values of cotangents. Here what turned out.

The unit circle and cotangent 
Value of a cotangent of 210 degrees same, as at a cotangent of 30 degrees. We take mathematics in hand and we check. The cotangent is the cosine divided into a sine. Values of a sine and cosine of 30 and 210 degrees can be taken
here.

Cotangent 210 degrees 
We already know
how to divide fraction into fraction. Formulas of transformation of angles of trigonometric functions.

Formulas of transformation of angles 
These formulas will be very useful to you.
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